Two-cycle-engine casing.



H. L. GREGWARE.

TWO-CYCLE ENGINE CASING. APPLICATION FILED JUNE 5. 1915.

Patented Apr. 11, 1916.

HARVEY L. GREGWARE, OF BEVERLY MASSACHUSETTS, ASSIGNOR 0F ONE-HALF T0 FRED M. PAGE, OF WEST LYNN, MASSACHUSETTS.

TWO-CYGLE-ENGINE CASING.

Specification of Letters Patent.

Patented Apr. 11, rare.

Application filed June 5, 1915. Serial No. 32,304.

To all whom it may concern:

Be it known that I, HARVEY L. GREGWARE, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Two-Cycle-Engine Casings; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to an improvement in two cycle engine casings;

The eificiency of that type of two cycle gasolene engines in which the crank shaft casing is utilized as a compression chamber, is seriously imp aired by reason of the leakage of explosive mixture which occurs through the journal boxes when the shaft bearings have become worn.

The purpose of the present invention is to produce a device which will prevent leakage of the explosive mixture from the crank shaft casing, even though the shaft bearings have become worn to a considerable extent. To the accomplishment of this purpose the invention consists of the device hereinafter described and claimed.

In the accompanying drawing illustrating the preferred form of the invention, is shown the journal section 1 of a two cycle engine casing. This journal section receives two crank shaft bearing bushings, an outer bushing 2, and an inner bushing 3, which afford bearings for the crank shaft 4 of the engine. As'the shaft wears away the softer metal composing the bushings, the explosive mixture escapes through the interstices existing between the shaft and thebushiugsfihereby impairing the efficiency of the engine. To eliminate this efficiency destroying leakage of gas or other explosive fluid, a pressure responsive check ring 5 is mounted upon the shaft and interposed between the adjacent inner ends of the bushings 2 and 3. The check ring is machined to fit nicely on the shaft so as to rotate therewith and to slide thereon in one direction on the up or compression stroke of the piston and in the opposite direction on the down or explosion stroke of the piston. In the illustration of the device, the check ring is shown in the position assumed by it on the up or compression stroke of the piston, that is to say, during the inspiration of the explosive mixture into the'crank casing or compres sion chamber. Upon the down or explosion stroke of the piston, that is to say, during the compressing of the explosive mixture in the crank casing, a small part of the mixture will pass into the ports 6 (there being a plurality of them), in the inner bushing 3. The impingement of the explosive mixture upon the inner surface of the annular web or fin 7 encircling the check ring5, causes the ring to be forced tightly against the inner end of the bushing 2, thereby effectively preventing further passage of the explosive mixture from the crank casing; for it will be observed that the joints formed between the periphery of the bushing 3 and the cylindrical bore of the journal sectionl of the crank casing, between the check ring and the shaft, and between the outer surface of the annular fin 7 and the inner end, of the bushing :2 are all practically air tight.

Conse quently, there willbe noescape' or leakage of the explosive mixture even though the bearings be worn considerably. The shaft bearlng surface 'of the check ring is made sufliciently long so that it may slide upon the shaft 4' without cramping. The inner ends of both bushings are recessed at 8 to permit the fin 7 of the check ring to contact when the check ring is in the position shown in the drawing, the oil flowing through the passage 11 .will fill up the space on the outer side of'the check ring, so that, when, on the compression of the explosive mixture in the crank casing or compression chamber, the check ring'is forced against the outer bushing, some of this oil will pass over the periphery of the fin 7 of the ring; and when inspiration takes place in the crank casing, this oil will be drawn into the ports 6 and from there will pass into the oil holes 12 leading from the ports 6 to the bearing in the cylindrical bore of the bushing 3, thereby lubricating the bearing.

Although the present invention has been described as especially adapted for use in connection with a two cycle engine, it will be understood that it is not restricted to application to two cycle engines, but may be used for various other purposes.

Having thus described my invention, what I claim is:

1. A two cycle engine having, in combination, a casing, bushings supported in the casing, a shaft supported in the bushings, and a check-ring mounted on the shaft adapted to move in onedirection to bring one side of the ring into operative position with respect to the bushings on the upstroke of the piston, and in the opposite direction to bring the other side of the ring into operative position with respect to the bushings on the down-stroke of the piston.

2. A two cycle engine having, in combination, a casing, two bushings supported in the casing, a shaft supported in the bushings and a check ring mounted on the shaft adapted to contact with one bushing on the up stroke of the piston and to contact with the other bushing on the down stroke of the piston.

3. A two cycle engine having, in combination, a casing, two bushings supported in the casing, a shaft supported in the bushings, and a check ring mounted on the shaft and interposed between the bushings, said ring being adapted to contact with one of the bushings on the up stroke of the piston and being adapted to contact with the other bushing on the down stroke of the piston.

A two cycle engine having, in combination, a casing for containing an explosive mixture, bushings supported in the casing, a shaft supported in the bushings, and a check ring mounted on the shaft adapted to contact with one of the bushings during the up stroke of the piston, and with the other bushing during the down stroke of and interoosed between the bushin s one of said bushings being provided with ports for permitting the explosive mixture to impinge against the check ring during the down stroke of the piston to force the check ring against the other bushing to prevent passage of the explosive mixture beyond the check ring.

6. A, two cycle engine having, in combination, two bushings supported in the cas ing having a space between them, a shaft supported in the bushings, a source of lubrication connected with the casing, a hole in one of the bushings for conveying the lubricant from the source to the shaft, a passage in the bushing communicating between the hole and the interbushing space adapted to supply the space with lubricant, ports in the other bushing giving into the interbushing space, and holes in, the second bushing coinmunicating between the ports and the shaft, said ports being adapted during the up stroke'of thepiston to draw the lubricant from the interbushing space and distribute it to the holes communicating between then and the shaft.

HARVEY L. GREGW ARE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

